The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 1998
Filed:
Apr. 23, 1996
Teruaki Tokutomi, Odawara, JP;
Kyoichi Mori, Kanagawa-ken, JP;
Toshinori Sugiyama, Kanagawa-ken, JP;
Hitachi Electronics Engineering Co., Ltd., Tokyo, JP;
Abstract
The improved for measuring the flying height of a magnetic head comprises a clear disk made of single-crystal sapphire, a spindle on which said disk is mounted for rotation, a mechanism for loading the magnetic head above one surface of said disk, measuring optics having a photoelectric converter that receives the light produced by interference of reflected light from said one surface of said disk with reflected light from the surface of said magnetic head as a result of application of light to said one surface through the other surface of said disk, and which converts the received interference light to an electric signal by means of said photoelectric converter, and a processing unit for calculating the flying height of said magnetic head in response to said electric signal from said measuring optics.